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JACQUES nELrEcH, or r FIR-ANGIE.

rnocnss or ummc rume etm-rownnns.

1 316,360. No Drawing.

To all whom it may concern:

- Be it known that I, Jacquesv Dmmnor citizen of'the Republic of France,and resident of Paris, France, (post-ofiice. address 19 AvenueParmentier,) have invented a new and useful Process of ManufacturingGun- Powders, which improvements are fully set compatible with theweapon used. This increase in the progressive action has up to now beenattempted with partial success by shaping the grains of the powder insuch a way that the surface provided for the emission of gas instead ofdiminishing, tends to increase as combustion proceeds.

Other attempts have been made on other lines, which may be termedchemical. Here the object in view is to diminish the power and thebrisance' of the powder, when it starts to burn, by superficialgelatinization, varnishing or similar processes; however, theseprocesses only partially. attain their end. They are unsuitable forpowders intended for use in heavy artillery and generally speaking theseattempts have proved to be of little practical use, while at the sametime, they are troublesome to carry out.

The problem has now been solved by forming heterogeneous powders inwhich there is a central core of a more brisant and v powerful charactersurrounded by a layer or sheet of powder which is less brisant and lesspowerful. In practice the following method is adopted A sheet of themore brisant powder which is obtained by ordinary means of manufactureis inclosed between two sheets or layers of less brisant powder. Afterhaving united the three (or more) of these layers of powder together (bythe means hereinafter described) the resulting thick sheet is cut in theusual manner to the desired dimensions (disks, pellets, tablets, stripsand the like). It has been found that perfect adhesion can be, obtainedbetween the covering layers and the middle or core layer, b exteriorpressure in the cold or warm eit er by means of a hydraulic press or bypassing the Specification 01' Letters Patent. Patented Sept. 16,1919.

Application filed April 29, 1919. Serial No. 298,529.

more sheets of powder through suitably arranged rollers. In such casethe union may be facilitated by coating one or more of the sheets with.a substance which acts as solvent for the powder.

The chemical composition and the thickness of the superimposed sheets ofthe core may be altered within very wide limits and allow the action 6.,the commencement of combustion) of the central core to be controlled sothat it takes place at the most suitable point in the bore of theweapon. Furthermore, the fact that the combustion starts with a lessbrisant powder considerably lessens wear and tear of the weapon as hasbeen shown by the most recent researches of various investigators.

Finally powders with alcentral core coated with one or more superimposedlayers of colloidal powder of a difl'erent composition from that'of thecentral core shows indisputable advantages from the point of view ofprogressive action and the lessenin of the wear and tear of the weaponin w ie they are used.

What I claim and desire to secure by Letters Patent of the United Statesis 1. The process'for the production of powder consisting in disposingan interior sheet of brisant colloidal powder between exterior sheets ofless brisant colloidal powder said sheets being caused to adhere by anysuitable mechanical pressure, the sheets being afterward cut into thedesired shapes and dimensions. v

2. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder containing nitro-glycerinbetween exterior sheets of less brisant colloidal powder said sheetsbeing caused to adhere by any suitable mechanical pressure, the sheetsbeing afterward cut 7 into the desired shapes and dimensions.

3. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder containing nitro-glycerinbetween exterior sheets of less brisant colloidal powder also containingnitro-glycerin said sheets being caused to adhere by any suitablemechanical pressure, the sheets being afterward cut into the desiredshapes and dimensions.

4. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder between exhso terior sheetsof less brisant colloidal powder said sheets being caused to adhere bypassing them through cylindrical rollers, the sheets being afterward cutinto the desired shapes and dimensions.

5. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder between exterior sheets ofless brisant colloidal powder said sheets being causedtoadhere bypressing them in a hydraulic press, the sheets being afterward cut intothe desired shapes and dimensions.

6. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder containing Intro-glycerinbetween exterior sheets of less brisant colloid-a1 powder containingnitroglycerin said sheets being caused to adhere by passing them throughcylindrical rollers, the sheets being afterward cut into the desiredshapes and dimensions.

7. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder between exterior sheets ofless brisant colloidal powder, coating certain of said sheets with asolvent for the powder said sheets being caused to adhere by anysuitable mechanical pressure, the sheets being afterward cut into thedesired shapes and dimensions.

8. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder between exteror sheets ofless brisant colloidal powder, coating certain of said sheets with asolvent for the powder said sheets being caused to adhere by subjectingthem to hydraulic pressure, the sheets being afterward out intothedesired shapesand dimensions.

9. The process for the production of powder consisting in disposing aninterior sheet of brisant colloidal powder between exterior sheets ofless brisant colloidal powder said sheets being caused to adhere by anysuitable pressure in the warm, the sheets being afterward cut into thedesired shapes and dimensions.

10. A powder comprising a core sheet of brisant powder inclosed betweensheets of less brisant powder.

In testimony whereof I have signed this specification.

JACQUES DELPE'C'H.

